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When developing new features, it will be useful to be able to compare server and client protocol versions.
For example, if a server is ahead of an old client, the server could gracefully degrade performance for clients that don't support the new functionality.
This change stores the client's protocol on the
Agent
so we can perform these checks.We also add a
checkAtLeast()
protocol helper function, and store the current protocol in a constant to avoid magic numbers.